StructTraits optimizations

cc/ipc/shared_quad_state_struct_traits.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_IPC_SHARED_QUAD_STATE_STRUCT_TRAITS_H_
 #define CC_IPC_SHARED_QUAD_STATE_STRUCT_TRAITS_H_
 
 #include "cc/ipc/shared_quad_state.mojom.h"
 #include "cc/quads/shared_quad_state.h"
 
 namespace mojo {
 
 template <>
 struct StructTraits<cc::mojom::SharedQuadState, cc::SharedQuadState> {
-  static gfx::Transform quad_to_target_transform(
+  static const gfx::Transform& quad_to_target_transform(
       const cc::SharedQuadState& sqs) {
     return sqs.quad_to_target_transform;
   }
 
   static gfx::Size quad_layer_bounds(const cc::SharedQuadState& sqs) {
     return sqs.quad_layer_bounds;
   }
 
   static gfx::Rect visible_quad_layer_rect(const cc::SharedQuadState& sqs) {
     return sqs.visible_quad_layer_rect;
@@ skipping 32 matching lines @@
       return false;
     out->blend_mode = static_cast<SkXfermode::Mode>(data.blend_mode());
     out->sorting_context_id = data.sorting_context_id();
     return true;
   }
 };
 
 }  // namespace mojo
 
 #endif  // CC_IPC_SHARED_QUAD_STATE_STRUCT_TRAITS_H_